REP key terms

Federal statute, also called Superfund, that makes parties responsible for releasing hazardous substances liable for cleanup costs and establishes a process for assessing and remediating contaminated sites.

A person or company that may be legally liable for contamination at a Superfund site, including current and past owners, operators, generators, and transporters of hazardous substances.

The pre-acquisition due diligence standard a buyer must meet to qualify for certain landowner liability protections under CERCLA, typically satisfied through a Phase I environmental site assessment.

A non-intrusive investigation of a property's history and surroundings, using records review, site visit, and interviews, to identify recognized environmental conditions before a transaction.

The presence or likely presence of hazardous substances or petroleum products on a property under conditions indicating an existing release, past release, or material threat of release.

An intrusive follow-up investigation that samples soil, groundwater, or soil vapor to confirm or rule out contamination suggested by a Phase I assessment.

Federal law governing discharges of pollutants into waters of the United States, implemented through permits, water quality standards, and pretreatment and stormwater programs.

A permit issued under the Clean Water Act that authorizes a facility to discharge pollutants from a point source to surface waters, subject to effluent limits and monitoring requirements.

Any discernible, confined, and discrete conveyance, such as a pipe, ditch, or channel, from which pollutants are or may be discharged to surface waters.

Water pollution that originates from diffuse sources such as runoff from farms, streets, or construction sites rather than a single identifiable discharge pipe.

A restriction on the quantity, rate, or concentration of pollutants that may be discharged from a point source, often based on technology standards or water quality criteria.

The maximum amount of a pollutant a water body can receive while still meeting water quality standards, allocated among point and nonpoint sources.

Federal statute regulating emissions of air pollutants through national ambient standards, new source performance standards, hazardous air pollutant rules, and operating permit programs.

Health- and welfare-based limits set for six criteria pollutants, used to classify areas as attainment or nonattainment and to drive state implementation planning.

A federally enforceable operating permit consolidating all applicable Clean Air Act requirements for a major source, including monitoring, recordkeeping, and reporting obligations.

A Clean Air Act permitting program that requires preconstruction review and pollution controls for new or modified major sources, with stricter requirements in nonattainment areas.

Federal law governing generation, transportation, treatment, storage, and disposal of solid and hazardous waste, from cradle to grave.

One of four properties, ignitability, corrosivity, reactivity, or toxicity, that causes a waste to be regulated as hazardous even if not specifically listed.

The principle that hazardous waste generators remain responsible for their waste from the point of generation through final disposal, even after transfer to a handler.

A hazardous waste generator that produces at least 1,000 kilograms per month of hazardous waste or more than 1 kilogram per month of acutely hazardous waste.

Federal law requiring facilities to report hazardous chemical inventories and releases, supporting local emergency planning and public access to chemical information.

A publicly available database of toxic chemical releases and waste management reported annually by covered facilities under the Emergency Planning and Community Right-to-Know Act.

The set of inventory, release, and emergency planning reporting obligations imposed on facilities that handle hazardous chemicals above threshold quantities.

A plan required for facilities storing certain quantities of oil aboveground or near navigable waters, specifying containment, inspection, and response procedures to prevent discharges.

A site-specific document identifying potential stormwater pollutant sources and the best management practices, inspections, and training used to control them.

The study of how contaminants move and change in the environment through processes such as advection, dispersion, sorption, volatilization, and degradation.

A body of contaminated groundwater that spreads downgradient from a source area, shaped by groundwater flow, dispersion, and attenuation processes.

Use of microorganisms to degrade or transform contaminants in soil or groundwater, often enhanced by adding nutrients, oxygen, or specific microbial cultures.

A remedy relying on natural physical, chemical, and biological processes to reduce contaminant concentrations, verified through long-term monitoring and institutional controls.

The CERCLA process that characterizes the nature and extent of contamination and evaluates treatment alternatives to support selection of a remedy.

The formal document explaining the selected remedial alternative for a Superfund site, including cleanup goals, rationale, and the basis for the choice.

A structured process to estimate the likelihood and magnitude of harm from environmental hazards, combining hazard identification, dose-response, exposure assessment, and risk characterization.

An estimate of the daily oral exposure to a substance that is likely to be without appreciable risk of harmful effects over a lifetime, used in risk assessments.

The route by which a person comes into contact with a contaminant, such as ingestion of soil, inhalation of vapors, or dermal contact with water.

A ranked approach to reducing workplace hazards, prioritizing elimination, substitution, engineering controls, and administrative controls before relying on personal protective equipment.

Clothing and equipment worn to reduce exposure to workplace hazards, including respirators, gloves, eye protection, and protective suits; considered a last line of defense.

A legally enforceable limit on workplace exposure to a chemical or physical agent, typically expressed as an eight-hour time-weighted average concentration.

A recommended occupational exposure guideline published by a professional scientific body, often used as a benchmark where no regulatory limit exists.

A procedure that checks whether a tight-fitting respirator seals properly on a worker's face, required before use and repeated periodically.

The requirement to inform and train workers about chemical hazards through labels, safety data sheets, and written programs so they can work safely.

A standardized document providing hazard, handling, exposure control, and emergency information about a chemical product, organized into sixteen sections.

Entry into a space with limited access and poor ventilation not designed for continuous occupancy, requiring hazard evaluation, atmospheric testing, and attendant support.

A set of principles governing professional conduct, typically emphasizing protection of public health and the environment, competence, objectivity, and disclosure of conflicts.

A situation in which a professional's financial or personal interests could improperly influence judgment, requiring disclosure and possible recusal from decisions.

Legal safeguards that shield employees from retaliation when they report suspected environmental violations, unsafe conditions, or other wrongdoing.

Failure to exercise the degree of care and skill ordinarily expected of a competent professional in similar circumstances, resulting in harm or loss.

The level of diligence and technical competence a reasonable professional would apply under similar conditions, used to judge whether conduct was appropriate.